Converged Networks

Topics: Noise, Comfort noise, VoIP terminology & concepts Pages: 3 (649 words) Published: June 15, 2014

NETW320 Converged Networks
Professor: Patrick Price
Week 2 Assignment: Silence Suppression
May 18, 2014

What is Silence Suppression?

Silence suppression, also called voice activation detection (VAD) is used with VoIP to save on bandwidth. It is, “a software application that allows a data network carrying voice traffic over the Internet to detect the absence of audio and conserve bandwidth by preventing the transmission of ‘silent packets’ over the network” (Rouse, 2008). During a phone conversation, usually only one side is talking at a time so the other side is listening. Without silence suppression, that silence was still being transmitted. So when using silence suppression, the use of bandwidth can be reduced up to 50% for voice calls. However, even with active silence suppression, “there is still data being sent, and some sound can be heard by the user at the other end of the line. That sound, however, will only approximate the sounds a microphone is picking up at the other end of the conversation” (What Is Silence Suppression). Then there is also a, “comfort noise generation (CNG) that generates background noise for voice communications during periods of silence that occur during the course of the conversation” (Rouse, comfort noise generator (CNG), 2007).

Why is it used?

It is used because it very advantageous for business, especially ones that don’t have a lot of bandwidth on their networks because their networks won’t be clogged as much when using silence suppression. Voice transmission is more sensitive than data so not having enough bandwidth can cause, “voice distortions, breaks and jumps between words, which could make effective communication all but impossible for the individuals trying to use it” (What Is Silence Suppression).

What could be used instead of silence suppression?

The only alternative I found to silence suppression is not to use it. There are some drawbacks to using silence suppression including clipping...

Bibliography: A. Xie, R. K. (2007, January). RFC 4788 Enhancements to RTP Payload Formats for EVRC Family Codecs. Retrieved May 21, 2014, from IETF:
Rouse, M. (2007, September). comfort noise generator (CNG). Retrieved May 21, 2014, from TechTarget:
Rouse, M. (2008, March). voice activation detection (VAD). Retrieved 05 21, 2014, from TechTarget:
What Is Silence Suppression. (n.d.). Retrieved May 21, 2014, from wiseGEEK:
Zopf, R. (2002, September). RFC 3389 Real-time Transport Protocol (RTP) Payload for Comfort Noise (CN). Retrieved May 21, 2014, from IETF:
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Converged Network Solutions Essay
  • The Internet Is Simply A Network Of Networks Nessa Essay
  • Essay about Introduction to Network Concepts
  • Slow Network Analysis Essay
  • Essay on Homework Network and Concept
  • Essay on Software Defined Networks
  • Information Technology and Network Collapse Essay
  • Study Guide: Living in a Network-Centric World Essay

Become a StudyMode Member

Sign Up - It's Free